package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;


public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlankIfStr(token)){
            return true;
        }
        //从redis中获取用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().
                entries(RedisConstants.LOGIN_USER_KEY + token);


        if (userMap.isEmpty()){
            return true;
        }

        //将查找到redis哈希对象转化成userDto对象
        UserDTO user = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(user);
        //刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token,
                RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
        //放行
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
